Feature: Could not creating Superfluid flows from sdk

Solution:
Install and import superfluid.py from PyPI.
Add helper methods on EthAccount

pyproject.toml

@@ -31,7 +31,10 @@ dependencies = [
     "jwcrypto==1.5.6",
     "python-magic",
     "typing_extensions",
-    "aioresponses>=0.7.6"
+    "aioresponses>=0.7.6",
+    "superfluid~=0.2.1",
+    "eth_typing==4.3.1",
+
 ]
 
 [project.optional-dependencies]

src/aleph/sdk/chains/ethereum.py

@@ -1,24 +1,78 @@
+from decimal import Decimal
 from pathlib import Path
-from typing import Optional, Union
+from typing import Awaitable, Dict, Optional, Set, Union
 
+from aleph_message.models import Chain
 from eth_account import Account
 from eth_account.messages import encode_defunct
 from eth_account.signers.local import LocalAccount
 from eth_keys.exceptions import BadSignature as EthBadSignatureError
+from superfluid import Web3FlowInfo
 
+from ..conf import settings
+from ..connectors.superfluid import Superfluid
 from ..exceptions import BadSignatureError
 from ..utils import bytes_from_hex
 from .common import BaseAccount, get_fallback_private_key, get_public_key
 
+CHAINS_WITH_SUPERTOKEN: Set[Chain] = {Chain.AVAX}
+CHAIN_IDS: Dict[Chain, int] = {
+    Chain.AVAX: settings.AVAX_CHAIN_ID,
+}
+
+
+def get_rpc_for_chain(chain: Chain):
+    """Returns the RPC to use for a given Ethereum based blockchain"""
+    if not chain:
+        return None
+
+    if chain == Chain.AVAX:
+        return settings.AVAX_RPC
+    else:
+        raise ValueError(f"Unknown RPC for chain {chain}")
+
+
+def get_chain_id_for_chain(chain: Chain):
+    """Returns the chain ID of a given Ethereum based blockchain"""
+    if not chain:
+        return None
+
+    if chain in CHAIN_IDS:
+        return CHAIN_IDS[chain]
+    else:
+        raise ValueError(f"Unknown RPC for chain {chain}")
+
 
 class ETHAccount(BaseAccount):
+    """Interact with an Ethereum address or key pair"""
+
     CHAIN = "ETH"
     CURVE = "secp256k1"
     _account: LocalAccount
+    chain: Optional[Chain]
+    superfluid_connector: Optional[Superfluid]
 
-    def __init__(self, private_key: bytes):
+    def __init__(
+        self,
+        private_key: bytes,
+        chain: Optional[Chain] = None,
+        rpc: Optional[str] = None,
+        chain_id: Optional[int] = None,
+    ):
         self.private_key = private_key
         self._account = Account.from_key(self.private_key)
+        self.chain = chain
+        rpc = rpc or get_rpc_for_chain(chain)
+        chain_id = chain_id or get_chain_id_for_chain(chain)
+        self.superfluid_connector = (
+            Superfluid(
+                rpc=rpc,
+                chain_id=chain_id,
+                account=self._account,
+            )
+            if chain in CHAINS_WITH_SUPERTOKEN
+            else None
+        )
 
     async def sign_raw(self, buffer: bytes) -> bytes:
         """Sign a raw buffer."""
@@ -37,6 +91,46 @@ def from_mnemonic(mnemonic: str) -> "ETHAccount":
         Account.enable_unaudited_hdwallet_features()
         return ETHAccount(private_key=Account.from_mnemonic(mnemonic=mnemonic).key)
 
+    def create_flow(self, receiver: str, flow: Decimal) -> Awaitable[str]:
+        """Creat a Superfluid flow between this account and the receiver address."""
+        if not self.superfluid_connector:
+            raise ValueError("Superfluid connector is required to create a flow")
+        return self.superfluid_connector.create_flow(
+            sender=self.get_address(), receiver=receiver, flow=flow
+        )
+
+    def get_flow(self, receiver: str) -> Awaitable[Web3FlowInfo]:
+        """Get the Superfluid flow between this account and the receiver address."""
+        if not self.superfluid_connector:
+            raise ValueError("Superfluid connector is required to get a flow")
+        return self.superfluid_connector.get_flow(
+            sender=self.get_address(), receiver=receiver
+        )
+
+    def update_flow(self, receiver: str, flow: Decimal) -> Awaitable[str]:
+        """Update the Superfluid flow between this account and the receiver address."""
+        if not self.superfluid_connector:
+            raise ValueError("Superfluid connector is required to update a flow")
+        return self.superfluid_connector.update_flow(
+            sender=self.get_address(), receiver=receiver, flow=flow
+        )
+
+    def delete_flow(self, receiver: str) -> Awaitable[str]:
+        """Delete the Superfluid flow between this account and the receiver address."""
+        if not self.superfluid_connector:
+            raise ValueError("Superfluid connector is required to delete a flow")
+        return self.superfluid_connector.delete_flow(
+            sender=self.get_address(), receiver=receiver
+        )
+
+    def update_superfluid_connector(self, rpc: str, chain_id: int):
+        """Update the Superfluid connector after initialisation."""
+        self.superfluid_connector = Superfluid(
+            rpc=rpc,
+            chain_id=chain_id,
+            account=self._account,
+        )
+
 
 def get_fallback_account(path: Optional[Path] = None) -> ETHAccount:
     return ETHAccount(private_key=get_fallback_private_key(path=path))

src/aleph/sdk/conf.py

@@ -38,6 +38,10 @@ class Settings(BaseSettings):
 
     CODE_USES_SQUASHFS: bool = which("mksquashfs") is not None  # True if command exists
 
+    AVAX_RPC: str = "https://api.avax.network/ext/bc/C/rpc"
+    AVAX_CHAIN_ID: int = 43114
+    AVAX_ALEPH_SUPER_TOKEN = "0xc0Fbc4967259786C743361a5885ef49380473dCF"  # mainnet
+
     # Dns resolver
     DNS_IPFS_DOMAIN = "ipfs.public.aleph.sh"
     DNS_PROGRAM_DOMAIN = "program.public.aleph.sh"

src/aleph/sdk/connectors/superfluid.py

@@ -0,0 +1,124 @@
+from __future__ import annotations
+
+import asyncio
+from decimal import Decimal
+from typing import TYPE_CHECKING, Optional
+
+from eth_utils import to_normalized_address, to_wei
+from superfluid import CFA_V1, Operation, Web3FlowInfo
+from web3 import Web3
+from web3.types import TxParams
+
+from aleph.sdk.conf import settings
+
+if TYPE_CHECKING:
+    from aleph.sdk.chains.ethereum import LocalAccount
+
+
+async def sign_and_send_transaction(
+    account: LocalAccount, tx_params: TxParams, rpc: str
+) -> str:
+    """
+    Sign and broadcast a transaction using the provided ETHAccount
+
+    @param tx_params - Transaction parameters
+    @param rpc - RPC URL
+    @returns - str - The transaction hash
+    """
+    web3 = Web3(Web3.HTTPProvider(rpc))
+
+    def sign_and_send():
+        signed_txn = account.sign_transaction(tx_params)
+        transaction_hash = web3.eth.send_raw_transaction(signed_txn.rawTransaction)
+        return transaction_hash.hex()
+
+    # Sending a transaction is done over HTTP(S) and implemented using a blocking
+    # API in `web3.eth`. This runs it in a non-blocking asyncio executor.
+    loop = asyncio.get_running_loop()
+    transaction_hash = await loop.run_in_executor(None, sign_and_send)
+    return transaction_hash
+
+
+async def execute_operation_with_account(
+    account: LocalAccount, operation: Operation
+) -> str:
+    """
+    Execute an operation using the provided ETHAccount
+
+    @param operation - Operation instance from the library
+    @returns - str - The transaction hash
+    @returns - str - The transaction hash
+    """
+    populated_transaction = operation._get_populated_transaction_request(
+        operation.rpc, account.key
+    )
+    transaction_hash = await sign_and_send_transaction(
+        account, populated_transaction, operation.rpc
+    )
+    return transaction_hash
+
+
+class Superfluid:
+    """
+    Wrapper around the Superfluid APIs in order to CRUD Superfluid flows between two accounts.
+    """
+
+    account: Optional[LocalAccount]
+
+    def __init__(
+        self,
+        rpc=settings.AVAX_RPC,
+        chain_id=settings.AVAX_CHAIN_ID,
+        account: Optional[LocalAccount] = None,
+    ):
+        self.cfaV1Instance = CFA_V1(rpc, chain_id)
+        self.account = account
+
+    async def create_flow(self, sender: str, receiver: str, flow: Decimal) -> str:
+        """Create a Superfluid flow between two addresses."""
+        if not self.account:
+            raise ValueError("An account is required to create a flow")
+        return await execute_operation_with_account(
+            account=self.account,
+            operation=self.cfaV1Instance.create_flow(
+                sender=to_normalized_address(sender),
+                receiver=to_normalized_address(receiver),
+                super_token=settings.AVAX_ALEPH_SUPER_TOKEN,
+                flow_rate=to_wei(Decimal(flow), "ether"),
+            ),
+        )
+
+    async def get_flow(self, sender: str, receiver: str) -> Web3FlowInfo:
+        """Fetch information about the Superfluid flow between two addresses."""
+        return self.cfaV1Instance.get_flow(
+            sender=to_normalized_address(sender),
+            receiver=to_normalized_address(receiver),
+            super_token=settings.AVAX_ALEPH_SUPER_TOKEN,
+        )
+
+    async def delete_flow(self, sender: str, receiver: str) -> str:
+        """Delete the Supefluid flow between two addresses."""
+        if not self.account:
+            raise ValueError("An account is required to delete a flow")
+        return await execute_operation_with_account(
+            account=self.account,
+            operation=self.cfaV1Instance.delete_flow(
+                sender=to_normalized_address(sender),
+                receiver=to_normalized_address(receiver),
+                super_token=settings.AVAX_ALEPH_SUPER_TOKEN,
+            ),
+        )
+
+    async def update_flow(self, sender: str, receiver: str, flow: Decimal) -> str:
+        """Update the flow of a Superfluid flow between two addresses."""
+        if not self.account:
+            raise ValueError("An account is required to update a flow")
+        return await execute_operation_with_account(
+            account=self.account,
+            operation=self.cfaV1Instance.update_flow(
+                sender=to_normalized_address(sender),
+                receiver=to_normalized_address(receiver),
+                super_token=settings.AVAX_ALEPH_SUPER_TOKEN,
+                flow_rate=to_wei(Decimal(flow), "ether"),
+            ),
+        )